4.4. STACKING

Ultimate Memory Guide. 4.4. STACKING

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4.4. STACKING

Many large servers and workstations require higher capacity modules
in order to reach system memory capacities of several gigabytes or
more. There are two ways to increase the capacity of a module.
Manufacturers can stack chips on top of one another, or they can
stack boards.

CHIP STACKING

With chip stacking, two chips are stacked together and occupy the
space that one chip would normally take up. In some cases, the
stacking is done internally at the chip manufacturing plant and can
actually appear to be one chip. In other cases the chips are
stacked externally. The example below shows two externally stacked
chips.

Example of externally stacked chips.

BOARD STACKING

As you might expect, board stacking involves putting two memory
module printed circuit boards (PCBs) together. With board stacking,
a secondary board mounts onto the primary board, which fits into
the memory socket on the system motherboard.